Comments (5)
This warning is shown when accessing a non-public class from a .java file that contains multiple classes.
Although it's not recommended, it is possible to declare multiple classes in one .java file. However, only one of those classes can be public:
=== A.java ===
public class A {
// ...
}
class B {
// this is an auxiliary class
}
============
from jpf-core.
The current code expects to have java.lang.CompoundEnumeration public standard Java class. But due to changes in the JDK, there seems to have no such public class. In JDK 9/10 for example it is declared in the java/lang/ClassLoader.java itself.
Please see the PR.
jpf-core/src/classes/modules/java.base/java/lang/ClassLoader.java
Lines 102 to 113 in cf154ec
References:
http://hg.openjdk.java.net/jdk10/jdk10/jdk/rev/47e7d7363249
from jpf-core.
It seems that this class is a merely utility that allows continuous iteration over all values from an array of enumerations. The class name is probably not important; the essential part lies in the behaviour. Maybe we can rewrite this method to return an instance of Enumeration that contains all values from the arrays resEnum[0] and resEnum[1]?
By the way, this Enumeration class is from JDK 1.0, and probably is not used widely anymore; its name is a bit unfortunate as one can confuse it with Enum. This Enumeration class seems to be a less poverful equivalent of Iterator.
from jpf-core.
Thanks for the tip. What about this implementation, though it is quite verbose?
public Enumeration<URL> getResources(String name) throws IOException {
Vector<URL> urlVector = new Vector<>(2);
if(parent == null) {
Iterator<URL> iterator = getSystemClassLoader().getResourcesURL(name).asIterator();
while (iterator.hasNext()) {
urlVector.add(iterator.next());
}
} else{
Iterator<URL> iterator = parent.getResources(name).asIterator();
while (iterator.hasNext()) {
urlVector.add(iterator.next());
}
}
Iterator<URL> iterator = findResources(name).asIterator();
while (iterator.hasNext()) {
urlVector.add(iterator.next());
}
return urlVector.elements();
}
from jpf-core.
Well, using Vector
is not recommended for new code (very inefficient), although it conveniently returns an Enumeration
. I would add a helper adapter class like the one below, and then used Iterator::forEachRemaining
to add elements to a collection such as ArrayList
.
public class EnumerationAdapter<E> implements Enumeration<E> {
private final Iterator<E> iterator;
public EnumerationProxy(Collection<E> collection) {
iterator = collection.iterator();
}
@Override
public boolean hasMoreElements() {
return iterator.hasNext();
}
@Override
public E nextElement() {
return iterator.next();
}
}
from jpf-core.
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